Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified optimal solution algorithm" » "modified optimal evolution algorithm", "modified optimal convolution algorithms", "modified optimal evolutionary algorithm", "modified thermal solution algorithm"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified multiobjective estimation algorithm") or ("modified optimal solution algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified multiobjective estimation algorithm") OR ("modified optimal solution algorithm"))*.
• Removing quotes may allow a broader search: (( modified multiobjective estimation algorithm ) or ( modified optimal solution algorithm ))*.